package me.techbird.nve.web.servlet;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求路径
        String uri = req.getRequestURI();
        //获取方法名称
        String methodName = uri.substring(uri.lastIndexOf("/")+1);
        try {
            //方法分发
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //暴力反射
//            method.setAccessible(true);
            method.invoke(this, req, resp);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
    }

    public void writeValue(Object object, HttpServletResponse response) throws IOException {
        ObjectMapper mapper  = new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(), object);
    }

    public String writeValue(Object object) throws JsonProcessingException {
        ObjectMapper mapper  = new ObjectMapper();
        return mapper.writeValueAsString(object);
    }
}
